Block chassis sled having one-third width computing and storage nodes for increased processing and storage configuration flexibility within a modular, scalable and/or expandable

ABSTRACT

Modular, expandable rack assembly physically supports components of information handling systems. Base structure of interconnected panels form volumetric space having front section and rear section, with opposing side panels forming front access space and rear access space, respectively, having width that supports insertion of standard full-width IT gear. Guides are located within interior surfaces of opposing side panels at the front section to rear section. Block chassis has frame that provides block height to enable insertion of at least one layer of up to N side-by-side fully functional IT gears within block chassis, which in turn is physically inserted into front section of base structure and held in place by opposing guides of opposing side panels. When N is 3, three side-by-side one-third width IT sleds, each containing IT gear, are inserted in respective one-third width IT bays of block chassis.

BACKGROUND

1. Technical Field

The present disclosure generally relates to an information handlingsystem and in particular to a block chassis and sled configuration for amodular, scalable, and expandable rack-based information handling systemand design.

2. Description of the Related Art

As the value and use of information continue to increase, individualsand businesses seek additional ways to process and store information.One option available to users is information handling systems. Aninformation handling system (IHS) generally processes, compiles, stores,and/or communicates information or data for business, personal, or otherpurposes, thereby allowing users to take advantage of the value of theinformation. Because technology and information handling needs andrequirements vary between different users or applications, informationhandling systems may also vary regarding what information is handled,how the information is handled, how much information is processed,stored, or communicated, and how quickly and efficiently the informationmay be processed, stored, or communicated. The variations in informationhandling systems allow for information handling systems to be general orconfigured for a specific user or specific use such as financialtransaction processing, airline reservations, enterprise data storage,or global communications. In addition, information handling systems mayinclude a variety of hardware and software components that may beconfigured to process, store, and communicate information and mayinclude one or more computer systems, data storage systems, andnetworking systems.

Standardization of dimensions of rack servers fosters design andmanufacturing economies for IT components. Rack assemblies, such asthose based on a 19 inch frame size, have a lateral dimension defined tohandle full-width server sleds containing IT gear for computing and/orstorage. Installing or servicing each rack server generally affects allof the IT gear in the full-width server sled. Storage IT gear containedin the IT sled is constrained to be one of cold serviceable or hotserviceable. When cold serviceable storage IT gear is selected for thefull-width server rack, any computing IT gear contained in thefull-width IT sled necessarily does not operate when the full-widthserver rack is being cold serviced.

BRIEF SUMMARY

Disclosed are a rack-based information handling system (IHS) and amethod for providing one-third width IT sleds within a modular, scalableand expandable, rack-based IHS. The racked-based IHS includes a modular,expandable rack assembly with opposing side panels spaced to receiveblock chasses capable of housing a plurality of information technology(IT) components from an open front side of the rack assembly. A blockchassis is inserted into the rack assembly having one or more rows forinsertion of IT sleds. Three side-by-side one-third width IT sleds haveside panels connected by a base panel and are inserted in at least oneof the one or more rows and each containing IT gear. Configuration anddesign aspects as well as functional use of the one-third width IT sledsare also disclosed.

According to at least one aspect of the present disclosure, a modular,expandable rack assembly for physically supporting components of one ormore information handling systems (IHSes) includes a base structurehaving a plurality of interconnected panels forming a volumetric spacehaving a front section and a rear section, with opposing side wallsforming a front access space and a rear access space, respectively,having a width that supports insertion of a standard full-width IT gear.A plurality of guides are located within interior surfaces of theopposing side walls at the front section, the plurality of guidesrunning from the front section to the rear section. A block chassis isphysically inserted into the front section of the base structure andheld in place by at least two opposing guides of the opposing sidewalls. The block chassis has a frame that provides a block height, whichenables insertion of at least one layer of up to N side-by-side fullyfunctional IT gears within the block chassis, where N is equal to threeand the chassis supports insertion of three side-by-side one-third widthIT sleds.

According to at least one aspect of the present disclosure, a method isprovided for assembling a rack-based IHS. The method includes assemblinga modular, expandable rack assembly having side panels spaced to receivea block chassis capable of housing a plurality of IT gear from an openfront side of the rack assembly. The method includes assembling at leastone block chassis having a frame that provides a block height, whichenables insertion of at least one layer of up to N side-by-side fullyfunctional IT gears within the block chassis, wherein N is an integerfrom among 1, 2, and 3. When N=3, the method includes providing one ormore layers of three (3) side-by-side fully functional IT gears insertedin the at least one block chassis, wherein the three side-by-side fullyfunctional IT gears comprise three one-third widths IT gear that are onethird a size of a standard width IT gear. Method further includesphysically inserting the block chassis into the rack assembly. Theresulting rack-based IHS can concurrently support full width, half widthand one-third width sleds within a same block or across multiple blocks.

The above presents a general summary of several aspects of thedisclosure in order to provide a basic understanding of at least someaspects of the disclosure. The above summary contains simplifications,generalizations and omissions of detail and is not intended as acomprehensive description of the claimed subject matter but, rather, isintended to provide a brief overview of some of the functionalityassociated therewith. The summary is not intended to delineate the scopeof the claims, and the summary merely presents some concepts of thedisclosure in a general form as a prelude to the more detaileddescription that follows. Other systems, methods, functionality,features and advantages of the claimed subject matter will be or willbecome apparent to one with skill in the art upon examination of thefollowing figures and detailed written description.

BRIEF DESCRIPTION OF THE DRAWINGS

The description of the illustrative embodiments can be read inconjunction with the accompanying figures. It will be appreciated thatfor simplicity and clarity of illustration, elements illustrated in thefigures have not necessarily been drawn to scale. For example, thedimensions of some of the elements are exaggerated relative to otherelements. Embodiments incorporating teachings of the present disclosureare shown and described with respect to the figures presented herein, inwhich:

FIG. 1 illustrates a block diagram of an example information handlingsystem (IHS) within which various aspects of the disclosure can beimplemented, according to one or more embodiments;

FIG. 2 illustrates a front isometric view of an example rack prior toinsertion of functional components for the rack to operate as an IHS,according to one or more embodiments;

FIG. 3 illustrates a front isometric view of the example rack of FIG. 2after insertion of functional components for the rack to operate as anIHS, according to one embodiment;

FIG. 4 illustrates a front view of a block having one-third width ITnodes, according to one embodiment;

FIG. 5 illustrates a front view of a block having half width IT nodes,according to one embodiment;

FIG. 6 illustrates a front view of a block having full width IT nodes,according to one embodiment;

FIG. 7 illustrates a rear isometric view of the block of FIG. 4,according to one embodiment;

FIG. 8 illustrates a front isometric view of the block of FIG. 4 withone-third width IT nodes partially extended from the block, according toone embodiment;

FIG. 9 illustrates a top view in horizontal cross section through ablock chassis of the rack assembly of FIG. 3 exposing one-third widthnodes, according to one embodiment;

FIG. 10 illustrates a detail view of the rack assembly of FIG. 9,according to one embodiment;

FIG. 11 illustrates an isometric view of an example one-third widthnode, according to one embodiment;

FIG. 12 illustrates an isometric exploded view of the example one-thirdwidth node of FIG. 11, according to one embodiment;

FIG. 13 illustrates a flow diagram of a method for physically supportingcomponents of one or more information handling systems (IHSes),according to one embodiment;

FIG. 14 illustrates a flow diagram of a method for providing one-thirdwidth IT gear, according to one embodiment; and

FIG. 15 illustrates a flow diagram of a method for providing electricalpower to the one-third width IT gear, according to one embodiment.

DETAILED DESCRIPTION

The present innovation provide fractional width information technology(IT) gear that enable side-by-side IT gear placement and design ofcorresponding fractional width it gear sleds that enable side-by-sideinsertion into a row of a block chassis of a standard width rack. Thepresent innovation further provides the fractional width IT sleds withdirect power coupling and block-level control when inserted into amodular, scalable and expandable information handling system (IHS) rack.For example, the IT sled may be full width, half width or one-thirdwidth. In one or more embodiments, the IT gear may include computernodes, servers, and/or nonvolatile storage that are individuallyinstalled into IT sleds that are one-third of a standard width of a rackserver. Scaling a rack infrastructure to support side-by-side placementof various types of IT system sleds enables hybrid combinations ofcompute and storage nodes for increased processing and storagecapability. In certain embodiments, a one-third width storage sled maybe shared by two one-third width compute sleds in order to enableservicing of cold storage devices such as hard disk drives whileallowing compute nodes to remain online. Moreover, an overall computedensity of a rack-based IHS may be increased.

In the following detailed description of exemplary embodiments of thedisclosure, specific exemplary embodiments in which the disclosure maybe practiced are described in sufficient detail to enable those skilledin the art to practice the disclosed embodiments. For example, specificdetails such as specific method orders, structures, elements, andconnections have been presented herein. However, it is to be understoodthat the specific details presented need not be utilized to practiceembodiments of the present disclosure. It is also to be understood thatother embodiments may be utilized and that logical, architectural,programmatic, mechanical, electrical and other changes may be madewithout departing from general scope of the disclosure. The followingdetailed description is, therefore, not to be taken in a limiting sense,and the scope of the present disclosure is defined by the appendedclaims and equivalents thereof.

References within the specification to “one embodiment,” “anembodiment,” “embodiments”, or “one or more embodiments” are intended toindicate that a particular feature, structure, or characteristicdescribed in connection with the embodiment is included in at least oneembodiment of the present disclosure. The appearance of such phrases invarious places within the specification are not necessarily allreferring to the same embodiment, nor are separate or alternativeembodiments mutually exclusive of other embodiments. Further, variousfeatures are described which may be exhibited by some embodiments andnot by others. Similarly, various requirements are described which maybe requirements for some embodiments but not other embodiments.

It is understood that the use of specific component, device and/orparameter names and/or corresponding acronyms thereof, such as those ofthe executing utility, logic, and/or firmware described herein, are forexample only and not meant to imply any limitations on the describedembodiments. The embodiments may thus be described with differentnomenclature and/or terminology utilized to describe the components,devices, parameters, methods and/or functions herein, withoutlimitation. References to any specific protocol or proprietary name indescribing one or more elements, features or concepts of the embodimentsare provided solely as examples of one implementation, and suchreferences do not limit the extension of the claimed embodiments toembodiments in which different element, feature, protocol, or conceptnames are utilized. Thus, each term utilized herein is to be given itsbroadest interpretation given the context in which that terms isutilized.

FIG. 1 illustrates a two-dimensional block diagram representation of anexample rack-based information handling system (IHS) 100, within whichone or more of the described features of the various embodiments of thedisclosure can be implemented to support one-third width compute andstorage nodes for a modular, scalable/expandable IHS. As atwo-dimensional image, certain of the presented components are shown indifferent orientations relative to each other for simplicity indescribing the connectively of the components. For purposes of thisdisclosure, an information handling system, such as IHS 100, may includeany instrumentality or aggregate of instrumentalities operable tocompute, classify, process, transmit, receive, retrieve, originate,switch, store, display, manifest, detect, record, reproduce, handle, orutilize any form of information, intelligence, or data for business,scientific, control, or other purposes. For example, an informationhandling system may be a handheld device, personal computer, a server, anetwork storage device, or any other suitable device and may vary insize, shape, performance, functionality, and price. The informationhandling system may include random access memory (RAM), one or moreprocessing resources such as a central processing unit (CPU) or hardwareor software control logic, ROM, and/or other types of nonvolatilememory. Additional components of the information handling system mayinclude one or more disk drives, one or more network ports forcommunicating with external devices as well as various input and output(I/O) devices, such as a keyboard, a mouse, and a video display. Theinformation handling system may also include one or more buses operableto transmit communications between the various hardware components.

As presented in FIG. 1, IHS 100 includes a rack assembly 102, which cancomprise one or more panels of sheet metal or other materialinterconnected to form a three dimensional volume generally referred toin the industry as a rack. Unique aspects of the rack assembly 102,which add to the modularity and expandability of IHS 100, are furtherillustrated and described in one or more of the three-dimensionalfigures presented herein. As is further presented by thesethree-dimensional figures, certain components indicated herein arelocated internal to the rack assembly 102 while other components can belocated external to rack assembly 102. These various components arecommunicatively connected to one or more components via power andcommunication cables, which are generally represented by the connectinglines of FIG. 1.

IHS 100 comprises a hierarchical arrangement of multiple managementmodules, along with power and cooling components, and functionalprocessing components or IT components within end nodes 104. Inparticular, the IHS 100 provides physical and functional support fornodes 104 of one or more fractional widths including one-third widthnodes 104 a, half-width nodes 104 b, full-width nodes 104 c, and N-widthnodes 104 d. “N” is an integer 1, 2 or 3 for a number of nodes 104 d ina row of a full-size server rack. “N” may also be used in reference to afractional portion of a full-size server rack, specifically the ratio1/N. IT gear 105 contained by the nodes 104, for example computing ITgear 105 a, non hot plug (NHP) storage IT gear 105 b, hot plug (HP)storage IT gear 105 c, and JBOD storage IT gear 105 d containing harddisk drives (HDDs) configured as Just A Bunch Of Disks (JBOD). Forexample, one-third width nodes 104 a may provide highly dense computeworkloads. Half-width nodes 104 b may provide a balance for compute andstorage workloads. Full width nodes 104 c may be used for dense storageworkloads and JBODs.

JBOD (for “just a bunch of disks,” or sometimes “just a bunch ofdrives”) is an array of hard disks that have not been configuredaccording to the RAID (redundant array of independent disks) system. TheRAID system stores the same data redundantly on multiple disks thatnevertheless appear to the operating system as a single disk. JBOD alsomakes the disks appear to be a single one by combining the drives intoone larger logical one. JBOD means the individual disks are presented(to a server) with no amalgamation, pooling or structure applied.

At the rack level, IHS 100 includes a management controller (MC) 106communicatively connected to infrastructure manager/module (IM) 108. MC106 can also be referred to as a Rack Management Controller (RMC). MC106 includes a microcontroller 110 (also generally referred to as aprocessor) which is coupled via an internal bus 112 to memory 114, I/Ointerface controller 116, removable storage device (RSD) interface 118and storage 120. Memory 114 can be flash or other form of memory.Illustrated within memory 114 is rack-level power management and control(RPMC or PMC) firmware 122, which is inclusive of the firmware thatcontrols the operation of MC 106 in communicating with and managing thedown-stream components (i.e., processing blocks 124 and end nodes 104,etc.) of IHS 100. IHS 100 may have blocks 124 having a block chassis 125that provides physical support for one or more widths of nodes 104. Forexample, a block chassis 125 a of block A 124 a may receive insertedone-third width nodes 104 a. A block chassis 125 b of block B 124 b mayreceive inserted half-width nodes 104 b. A block chassis 125 c of blockC 124 c may receive inserted full-width nodes 104 c. A block chassis 125d of block D 124 d may receive N width nodes 104 d. Each of the blockchasses 125 a-d are laterally sized for the full width of the rackassembly 102.

I/O interface controller 116 provides connection points and hardware andfirmware components that allow for user interfacing with the MC 106 viaone or more connected I/O devices, such as a keyboard, a mouse, and amonitor. I/O interface controller 116 enables a user to enter commandsvia, for example, a command line interface (CLI), and to view statusinformation of IHS 100. I/O interface controller 116 also enables thesetting of operating parameters for IHS 100, among other supported userinputs. RSD interface 118 enables insertion or connection of a RSD 126,such as a storage device (SD) card containing pre-programmable operatingfirmware for IHS 100. In at least one embodiment, a RSD 126 stores acopy of the operating parameters of IHS 100 and the RSD 126 can beutilized to reboot the IHS 100 to its operating state following a systemfailure or maintenance shutdown. Storage 120 can be any form ofpersistent storage and can include different types of data and operatingparameters (settings) 127 utilized for functional operation of IHS 100.Among the stored content within storage 120 may also be algorithms 128for fan and/or power and/or control. For example, the algorithms 128 canfacilitate hot servicing or cold servicing of blocks 124, individuallylabeled as blocks A-D 124 a-124 d, or nodes 104. In one or moreembodiments, IHS 100 can optionally include at least one other MC,illustrated as secondary MC 130, to provide a redundant configuration ofMCs 106/130 which are both simultaneously active and functioning. Withthese embodiments, the redundant configuration enables IHS 100 tocontinue operating following a failure of either of the MCs 106/130 orin the event one of the MCs 106/130 has to be taken offline formaintenance.

Infrastructure manager (IM) 108 includes cooling subsystem interface134, Ethernet switch 136, power distribution interface 138 and networkinterface 140. Network interface 140 enables IHS 100 and specificallythe components within IHS 100 to connect to communicate with or via anexternal network 142.

In addition to the above described MC 106 and IM 108, IHS 100 furthercomprises a fan and cooling subsystem 143, power subsystem 144, and theplurality of processing blocks A-D 124 a-124 d. In one implementation,each processing block 124 has an associated block controller (BC) 146.Each block 124 may be enclosed within a block chassis 125 that isinserted to the rack assembly 102 with connectors and conductors alignedfor automatic engagement. For example, each block 124 may serve a basicphysical building unit with the rack assembly 102, consuming 4 U ofvertical space with four horizontal rows of sleds in each block 124 at 1U per TOW.

A rack unit, U or RU is a unit of measure that describes the height ofequipment designed to mount in a 19-inch rack or a 23-inch rack. The19-inch (482.6 mm) or 23-inch (584.2 mm) dimension refers to the widthof the equipment mounting frame in the rack including the frame; thewidth of the equipment that can be mounted inside the rack is less. Onerack unit is 1.75 inches (44.45 mm) high. A 19-inch rack is astandardized frame or enclosure for mounting multiple equipment modules.Each module has a front panel that is 19 inches (482.6 mm) wide,including edges or ears that protrude on each side which allow themodule to be fastened to the rack frame with screws.

Cooling subsystem 143 includes a plurality of fan modules 152, or merely“fans”, located in fan receptacles 153 within a respective fan baymodule 154 and can be different sizes and provide different numbers offan modules 152 per fan bay module 154. Also included within coolingsubsystem 143 is a plurality of temperature sensors 150, which arefurther shown distributed within or associated with specific blocks 124.Each fan bay module 154 is located behind (or in the air flow path of) aspecific block 124 and the fan modules 152 are communicatively coupledto and controlled by the block controller 146 associated with that block124. Within each block 124 is at least one, and likely a plurality, offunctional/processing nodes 104. A single block controller 146 can beassigned to control multiple blocks 124 b-124 c, when the number ofcomputing nodes 104 within an individual block does not exceed thepre-established block controller (BC) threshold. Each end node 104controlled by a respective block controller 146 is communicativelycoupled to block controller 146 via one or more cables (not shown).Ethernet switch 136 enables MC 106 to communicate with block controllers146 via a network of Ethernet cables 156.

Power subsystem 144 generally includes a plurality of power supply units(PSUs) 158, one or more power distribution units (PDUs) 160, and amodular vertical busbar assembly 162. Power subsystem 144 also includesa source of external AC source 164 connected to an internal AC power166. Each of the individual computing nodes 104 and other componentswithin the IHS 100 that require power are either directly coupled tomodular vertical busbar assembly 162 or coupled via power cables to PDUs160 to obtain power. As one aspect of power distribution within IHS 100,MC 106 can monitor power consumption across the IHS 100 as well as theamount of available power provided by the functional PSUs 158 andtrigger changes in power consumption at the block level and ultimatelyat the (processing) node level based on changes in the amount ofavailable power and other factors. Control of the power subsystem 144can, in one embodiment, be provided by a separate power controller 168,separate from MC 106. As further illustrated, one additional aspect ofthe power subsystem 144 for the IHS 100 is the inclusion of AC switchbox 170. AC switch box 170 is communicatively coupled to both IM 108 andpower subsystem 144. AC switch box 170 includes a plurality of AC inputs172 and a plurality of AC outlets 174 that are utilized to supply powerto the PSUs 158, and other functional components of the IHS 100.

The modular vertical busbar assembly 162 distributes DC power for therack assembly 102 to each vertical set of four nodes 104 of a respectiveblock 124 via a power interface board (PIB) 176. PIB 176 is a narrowboard that provides power and signals to four (4) nodes in a blockchassis 124. One PIB 176 provides power to the four (4) full-width nodes104 c of block C 124 c, two (2) PIBs 176 provide power to the eight (8)half-width nodes 104 b of block B 124 b, and three (3) PIBs 176 providepower to the twelve (12) one-third width nodes 104 a of block A 124 a.Each PIB 176 connects to one 4-node connector in the block controller146. PIBs 176 may be electrically connected for DC power and ground tothe modular vertical busbar assembly 162 by a horizontal busbar 178 ofeach block chassis 125.

In one or more embodiments, the rack assembly 102 includes a basestructure 180 assembled from interconnected panels 182 to form avolumetric space 184 having a front section 186 and a rear section 188.Opposing side walls 190 of the base structure 180 form a front accessspace 192 and a rear access space 194, respectively, having a width thatsupports insertion of standard full-width IT gear 105. Guides 196 arelocated within interior surfaces of the opposing side walls 190 at thefront section 186, running from the front section 186 to the rearsection 188. The block chasses 125 have a frame that provides a blockheight, which enables insertion of at least one layer of up to Nside-by-side fully functional IT gears 105 within the block chassis 125.The block chassis 125 is physically inserted into the front section 186of the base structure 180 and held in place by at least two opposingguides 196 of the opposing side walls 190.

In one embodiment, N is an integer from among 1, 2, and 3. When N=2, themodular, expandable rack assembly 102 includes at least one blockchassis 125 b having one or more rows of two (2) side-by-side fullyfunctional IT gears 105, such as half-width nodes 104 a-b, insertedtherein. The two side-by-side fully functional IT gears 105 comprise twoone-half width IT gear that are one half a size of a standard width ITgear. When N=3, the modular, expandable rack assembly 102 has at leastone block chassis 125 a having one or more rows of fully functional ITgears 105 a-d in three (3) side-by-side one-third width nodes 104 ainserted therein. The fully functional IT gears 105 a-d within the threeside-by-side in one-third width nodes 104 a are one third a size of astandard width IT gear.

For purposes of the disclosure all general references to an informationhandling system shall refer to the rack-level IHS 100, while referencesto actual computing nodes 104 within the IHS 100 shall be referenced aschassis level computing nodes 104 or IT components. It is furtherappreciated that within the rack-level IHS 100 can be implementedseparate domains or systems that are independent of each other and canbe assigned to different independent customers and/or users. However,this level of detail of the actual use of the computing nodes 104 withinthe general rack-level IHS 100 is not relevant to the descriptionsprovided herein and are specifically omitted. For clarity, a singlerack-level IHS 100 is illustrated. However, an IHS may include multipleracks. For example, one rack may contain only storage sleds with otherracks providing computing nodes. In an exemplary embodiment, componentsof the IHS 100 are organized into a hierarchy as described in TABLE A:

TABLE A Level Device/Module Acronym Comments Domain Level Management MCIn front of Controller Power Bay Domain Level Infrastructure IM In rearof module Power Bay Domain Level AC Switch Box ACSB Behind networkswitches Domain Level Power Bay PBPM Connects to 10 Power Modulesupplies and two MCs. Designed by Delta Domain Level Power Bay PowerHolds PBPM, MCx2, Bay IM, & ACSB Block Level Block Controller BC HotPlug Fan Controller + Serial & Node Interface Block Level BlockController BCDB Fixed in Block Distribution Board (BCDB) Block LevelPower Interface PIB Columns of Board 4 nodes Block Level TemperatureProbe TPB Ambient Temperature Board Sensor Node Level Node Power NPDB Ineach node Distribution Board Node Level 4 drive HDD BP x4HDDBP Used in12 drive FW HP sled Node level 2 drive HDD PB x2HDDBP Used for HP 2.5″in HW sled

Further, those of ordinary skill in the art will appreciate that thehardware components and basic configuration depicted in the variousfigures and described herein may vary. For example, the illustrativecomponents within IHS 100 are not intended to be exhaustive, but ratherare representative to highlight components that can be utilized toimplement various aspects of the present disclosure. For example, otherdevices/components/modules may be used in addition to or in place of thehardware and software modules depicted. The depicted examples do notconvey or imply any architectural or other limitations with respect tothe presently described embodiments and/or the general disclosure.

FIG. 2 illustrates a front isometric view 200 of an example rackassembly 102 that is ready to receive functional components within afirst frame assembly 202 that includes an upper standard zone 204 a anda lower standard zone 204 b on either side of a power and switch zone206. The rack assembly 102 may also include a second frame assembly 208attached on top of the first frame assembly 202 to provide an expansionzone 210 for the rack assembly 102. In an illustrative configuration,the second frame assembly 208 has received a block chassis 125 apartitioned to receive one-third width nodes 104 a (FIG. 1). The upperstandard zone 204 a of the first frame assembly 202 may be configured asa 20 GU server zone divided horizontally into four tiers by shelves 212.Each shelf 212 may provide full-width IT bays 214 or include partitionsfor partial-width bays. The power and switch zone 206 of the rackassembly 102 includes a switch bay 216 (2 U), two power bays 218 (3GU×2), and another switch bay 216 (2 U). The lower standard zone 204 bmay be configured as a 25 GU server zone divided into tiers by shelves212 into full-width IT bays 214.

Opposing sidewalls 220 of the rack assembly 102 are spaced to receive ablock chasses 125 (FIG. 1), such as block A chassis 125 a. Block Achassis 125 a is capable of housing IT components as a block A node 124a that is inserted from an open front side 222 of the rack assembly 102.Block A chassis 125 a has one or more rows for insertion of three (3)side-by-side one-third width IT sleds 226 (FIG. 9) that are inserted inat least one of the one or more rows and each contain IT gear 105. Inone embodiment, guides 196 (FIG. 1) are provided inside of the block Achassis 125 a for supporting insertion of the one-third width IT sleds226. The guides 196 present a thin lateral thickness of a panel so thatthe lateral width of a row of three one-third IT sleds 226 substantiallydefines the width of the block A chassis 125 a. The one-third width ITsleds 226 include a base panel 228 that hold the IT gear 105 (e.g., amotherboard with interconnected functional components) between opposingside panels 230. In one embodiment as an alternative to guides 196,horizontal slides 132 on the outer surfaces of the opposing side panels230 may guide the IT sleds 226 into the block A chassis 125 a. Forexample, interior side surfaces of the block A chassis 125 a and threeIT sleds 226 in a selected row may be in flush alignment, either as flatvertical surfaces or a nonflat surface with horizontally definedcontours that define horizontal slides 132. Right and left interiorsides of the block A chassis 125 a and right and left side panels 230 ofthe one-third width IT sleds 226 are corresponding mirror images of oneanother for sliding frictional alignment. In one embodiment, theone-third width IT sleds 226 each have a width that is less than orequal to one-third of a standard nineteen (19) inch width rack that, inflush lateral alignment, combine to represent a nineteen (19) inch wideinterior space of the block chassis 125 (FIG. 1).

FIG. 3 illustrates the example modular, expandable rack assembly 102having functional components inserted therein to operate as one or morerack-based IHSs 100. Then, the two power bays 218 (FIG. 2) contain powerbay chasses 300. FIGS. 3-4 illustrate block 124 a having a block chassis125 a that receives one-third width nodes 104 a. FIGS. 3 and 5illustrate block 124 b having a block chassis 125 b that receiveshalf-width nodes 104 b. FIG. 6 illustrates block 124 c having a blockchassis 125 c that receives full-width nodes 104 c for the rack assembly102 (FIG. 3).

FIG. 7 illustrates a rear view 700 of the block 124 a having the blockchassis 125 a with three PIBs 176 that receive power from a horizontalbusbar 178 having a power conductor 702 and a ground conductor 704.

FIG. 8 illustrates a front view 800 of the block chassis 125 a havingthree one-third width nodes 104 a. Rather than including guides 196(FIG. 1), the three side-by-side fully functional IT gears or IT sleds226 have side panels 230, which can be configured with exterior physicalaffordances that enable slideable connection between adjacent IT sleds.For example, in the illustrated embodiment, the side panels 230 of ITsleds 226 can respectively have indentations 802 and protrusions 804that enable interlocking of a protrusions 804 of a first side of one ofthe three IT gears or IT sleds 226 into an indentation 802 of theadjacent side of a next IT gear or IT sled 226 to provide flushedside-by-side alignment of each of the three IT gears or IT sleds 226within the corresponding layer of the block chassis 125 a. A relativelyflat surfaced side panel 230 may also be utilized to allow forfrictional sliding against other side panels.

FIGS. 9-10 illustrate a top view 900 in horizontal cross section of theexample rack assembly 102 illustrating aft facing power connections 902of each IT sled 226 extended through a rear side of the block chassis125 to contact a horizontal busbar 178. The horizontal busbar 178 inturn has been placed into electrical connection with the vertical busbarassembly 162. In one embodiment, the row of three one-third width ITsleds 226 may be a non hot plug storage node placed between andfunctionally shared by two computing nodes. The computing nodes may beconfigured to continue operating during cold servicing of the non hotplug storage node when the middle IT sled 226 is withdrawn from aninserted position in the chassis 125, removing power from the storagenode.

FIGS. 11-12 illustrate an isometric view 1100 of a one-third width ITsled 226 that contains IT gear 105 oriented depthways along amotherboard 1102 from front to back. For example, a riser cable 1104 andPCIE (Peripheral Component Interconnect Express) card 1106 are orienteddepth wise. With particular reference to FIG. 12, the motherboard 1102has an elongated depthwise shape. Four 4×3.5 hard disk drive (HDD)modules 1108 and one 2×2.5 HDD module 1110 are arrayed in a single rowdepthwise rather than in a double row. Depthwise orientation may also beachieved by segregating a computing node to one IT sled 226 and anadjacent storage node to another IT sled 226 for balanced compute andstorage workloads rather than using a half width or full width IT sled226 with both functionalities. More IT components may be placed in asingle row thereby rather than in double rows.

FIG. 13 illustrates a method 1300 for physically supporting componentsof one or more information handling systems (IHSs). Method 1300 includesassembling a modular, expandable rack assembly having side walls spacedto receive a block chassis capable of housing a plurality of informationtechnology (IT) gear from an open front side of the rack assembly (block1302). In one embodiment, method 1300 further includes assembling themodular, expandable rack assembly by assembling a base structurecomprising a plurality of interconnected panels forming a volumetricspace having a front section and a rear section, with the opposing sidewalls forming a front access space and a rear access space,respectively, having a width that supports insertion of a standardfull-width IT gear (block 1304). Method 1300 further comprises forming aplurality of guides located within interior surfaces of the opposingside walls at the front section, the plurality of guides running fromthe front section to the rear section for receiving the block chassis(block 1306).

In block 1308, method 1300 includes assembling a block chassis having aframe that provides a block height, which enables insertion of at leastone layer of up to N side-by-side fully functional IT gears within theblock chassis. In one embodiment, the method 1300 includes selecting Nas an integer from among 1, 2, and 3 (block 1310). When N=2, method 1300includes providing at least one block chassis having one or more layersof two (2) side-by-side sleds of fully functional IT gears insertedtherein. The two side-by-side sleds of fully functional IT gearscomprise two one-half width IT gear that are one half a size of astandard width IT gear (block 1312). In block 1314, when N=3, method1300 includes providing at least one block chassis having one or morelayers of three (3) side-by-side sleds of fully functional IT gearsinserted therein. The three side-by-side sleds of fully functional ITgears comprise three one-third width IT gears that are one third a sizeof a standard width IT gear. Then method 1300 ends.

FIG. 14 illustrates a method 1400 for providing the one-third width ITgear. In block 1402, method 1400 includes providing the one-third widthIT gear each having a width that is less than or equal to one-third of astandard nineteen (19) inch width rack that combine to create a 19 inchwide sled chassis (block 1404). For example, internal guides within theblock chassis may have a narrow lateral width, allowing the one-thirdwidth IT gear to occupy substantially all of the volume of the blockchassis. In another particular embodiment, method 1400 further includesproviding the three side-by-side fully functional IT gears by providingside panels having exterior indentations and protrusions that enableinterlocking of a protrusion of a first side of one of the three ITgears into an indentation of the adjacent side of a next IT gear toprovide flushed side-by-side alignment of each of the three IT gearswithin the corresponding layer of the block chassis (block 1406). In oneembodiment, method 1400 includes inserting a row of three selectedone-third width sleds. Each one-third width sled may be a selected oneof a computing node, a non hot plug storage node, a hot plug storagenode, and a storage node configured as Just A Bunch Of Disks (JBOD)(block 1408). The fractional width provides greater block configurationflexibility in handling workloads that are more computing intensive,more storage intensive, or have a balanced workload. The fractionalwidth also provides greater configuration flexibility in selecting typesof storage nodes that may require hot swap servicing.

In one embodiment, method 1400 further includes inserting a selected rowof three one-third width sleds comprising a non hot plug storage nodeplaced between and to be functionally shared by two computing nodes(block 1410). The fractional width allows for computing nodes to beplaced adjacent to a storage node for functional communication but notin the same IT sled. Withdrawing an IT sled to service the storage nodedoes not require withdrawing the computing node that is separatelycontained in its own IT sled. Thus, the computing node may continue tooperate. In block 1412, method 1400 includes configuring the computingnodes to continue operating online during cold servicing of the non hotplug storage node. Then method 1400 ends.

FIG. 15 illustrates a method 1500 for providing electrical power to theone-third width IT gear. Method 1500 includes attaching a verticalbusbar to the rear section of the rack assembly (block 1502). In block1504, method 1500 includes providing a horizontal busbar electricallyconnected to each one-third width IT bay of the block chassis andaligned to electrically connect to the vertical busbar. In block 1506,method 1500 includes inserting the block chassis into the rack assemblyto electrically connect the horizontal busbar to the vertical busbar forproviding electrical power to each of the one-third width IT gearsinserted into the block chassis. Then method 1500 ends.

In the above described flow charts of FIGS. 13-15, one or more of themethods may be embodied in an automated manufacturing system thatperforms a series of functional processes. In some implementations,certain steps of the methods are combined, performed simultaneously orin a different order, or perhaps omitted, without deviating from thescope of the disclosure. Thus, while the method blocks are described andillustrated in a particular sequence, use of a specific sequence offunctional processes represented by the blocks is not meant to imply anylimitations on the disclosure. Changes may be made with regards to thesequence of processes without departing from the scope of the presentdisclosure. Use of a particular sequence is therefore, not to be takenin a limiting sense, and the scope of the present disclosure is definedonly by the appended claims.

One or more of the embodiments of the disclosure described can beimplementable, at least in part, using a software-controlledprogrammable processing device, such as a microprocessor, digital signalprocessor or other processing device, data processing apparatus orsystem. Thus, it is appreciated that a computer program for configuringa programmable device, apparatus or system to implement the foregoingdescribed methods is envisaged as an aspect of the present disclosure.The computer program may be embodied as source code or undergocompilation for implementation on a processing device, apparatus, orsystem. Suitably, the computer program is stored on a carrier device inmachine or device readable form, for example in solid-state memory,magnetic memory such as disk or tape, optically or magneto-opticallyreadable memory such as compact disk or digital versatile disk, flashmemory, etc. The processing device, apparatus or system utilizes theprogram or a part thereof to configure the processing device, apparatus,or system for operation.

While the disclosure has been described with reference to exemplaryembodiments, it will be understood by those skilled in the art thatvarious changes may be made and equivalents may be substituted forelements thereof without departing from the scope of the disclosure. Inaddition, many modifications may be made to adapt a particular system,device or component thereof to the teachings of the disclosure withoutdeparting from the essential scope thereof. Therefore, it is intendedthat the disclosure not be limited to the particular embodimentsdisclosed for carrying out this disclosure, but that the disclosure willinclude all embodiments falling within the scope of the appended claims.Moreover, the use of the terms first, second, etc. do not denote anyorder or importance, but rather the terms first, second, etc. are usedto distinguish one element from another.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the disclosure.As used herein, the singular forms “a”, “an” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. It will be further understood that the terms “comprises”and/or “comprising,” when used in this specification, specify thepresence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or groups thereof.

The description of the present disclosure has been presented forpurposes of illustration and description, but is not intended to beexhaustive or limited to the disclosure in the form disclosed. Manymodifications and variations will be apparent to those of ordinary skillin the art without departing from the scope of the disclosure. Thedescribed embodiments were chosen and described in order to best explainthe principles of the disclosure and the practical application, and toenable others of ordinary skill in the art to understand the disclosurefor various embodiments with various modifications as are suited to theparticular use contemplated.

What is claimed is:
 1. A rack-based information handling system (IHS),comprising: a modular, expandable rack assembly having opposing sidepanels spaced to receive block chasses capable of housing a plurality ofinformation technology (IT) components from an open front side of therack assembly; a block chassis insertable into the rack assembly havingone or more rows for insertion of IT sleds; and three side-by-sideone-third width IT sleds having side panels connected by a base paneland inserted in at least one of the one or more rows and each containingIT gear.
 2. The rack-based IHS of claim 1, wherein the block chassiscomprises guides defining one-third IT bays for insertion of the one ormore rows for insertion of IT sleds.
 3. The rack-based IHS of claim 1,wherein the one-third width IT sleds have flat side panels aligned forflush alignment with an adjacent one-third width IT sled for frictionalslideable insertion and removal.
 4. The rack-based IHS of claim 1,wherein a right side panel of a selected one-third width IT sled hashorizontally aligned contour of an indentation and a protuberance thatis mirrored by a corresponding left side panel of an adjacent one-thirdwidth IT sled for guided, slideable insertion and removal of one of theselected and adjacent one-third width IT sleds.
 5. The rack-based IHS ofclaim 1, wherein the one-third width IT sleds each have a width that isless than or equal to one-third of a standard nineteen (19) inch widthrack that, in lateral flushed alignment and slideable with an adjacentone-third width IT sled, combine to represent a 19 inch wide interiorspace of the block chassis.
 6. The rack-based IHS of claim 1, whereinthe three side-by-side one-third width IT sleds contain one or more ofcomputing IT gear, non hot plug storage IT gear, a hot plug storage ITgear, and Just A Bunch Of Disks (JBOD) storage IT gear.
 7. Therack-based IHS of claim 4, wherein the one or more one-third width ITsleds contain IT gear oriented depthways along a motherboard from frontto back.
 8. The rack-based IHS of claim 1, wherein a selected row ofthree one-third width IT sleds comprises a non hot plug storage nodeplaced between and functionally shared by two computing nodes, whereinthe computing nodes are configured to continue operating during coldservicing of the non hot plug storage node.
 9. The rack-based IHS ofclaim 1, further comprising a vertical busbar attached to a rear side ofthe rack assembly, wherein the block chassis comprises a horizontalbusbar providing an electrical connection at a rear of each one-thirdwidth IT bay and aligned to electrically connect to the vertical busbarto provide electrical power to each of the one-third width IT sleds inresponse to the block chassis being inserted into the rack assembly. 10.A modular, expandable rack assembly for physically supporting componentsof one or more information handling systems (IHSes), the rack assemblycomprising: a base structure comprising a plurality of interconnectedpanels forming a volumetric space having a front section and a rearsection, with opposing side walls forming a front access space and arear access space, respectively, having a width that supports insertionof a standard full-width IT gear; a plurality of guides located withininterior surfaces of the opposing side walls at the front section, theplurality of guides running from the front section to the rear section;and a block chassis having a frame that provides a block height, whichenables insertion of at least one layer of up to N side-by-side fullyfunctional IT gears within the block chassis, wherein the block chassisis physically inserted into the front section of the base structure andheld in place by at least two opposing guides of the opposing sidewalls.
 11. The modular, expandable rack assembly of claim 10, wherein Nis an integer from among 1, 2, and 3, and when N=2, the modular,expandable rack assembly comprises: at least one block chassis havingone or more rows of two (2) side-by-side fully functional IT gearsinserted therein, wherein the two side-by-side fully functional IT gearscomprise two one-half width IT gear that are one half a size of astandard width IT gear.
 12. The modular, expandable rack assembly ofclaim 10, wherein N=3, and the modular, expandable rack assemblycomprises: at least one block chassis having one or more rows of three(3) side-by-side fully functional IT gears inserted therein, wherein thethree side-by-side fully functional IT gears comprise three one-thirdwidth IT gear that are one third a size of a standard width IT gear. 13.The modular, expandable rack assembly of claim 12, wherein the threeside-by-side fully functional IT gears each comprise: side panels havingexterior indentations and protrusions that enable interlocking of aprotrusion of a first side of one of the three IT gears into anindentation of the adjacent side of a next IT gear to provide flushedside-by-side alignment of each of the three IT gears within thecorresponding layer of the block chassis; and a base panel connected tothe side panels to create a one third width IT sled.
 14. A method forphysically supporting components of one or more information handlingsystems (IHSes), the method comprising: assembling a modular, expandablerack assembly having side panels spaced to receive a block chassiscapable of housing a plurality of information technology (IT) gear froman open front side of the rack assembly; assembling at least one blockchassis having a frame that provides a block height, which enablesinsertion of at least one layer of up to N side-by-side fully functionalIT gears within the block chassis, wherein N is an integer from among 1,2, and 3; when N=3, providing one or more layers of three (3)side-by-side fully functional IT gears inserted in the at least oneblock chassis, wherein the three side-by-side fully functional IT gearscomprise three one-third widths IT gear that are one third a size of astandard width IT gear; and physically inserting the block chassis intothe rack assembly.
 15. The method of claim 14, wherein assembling themodular, expandable rack assembly further comprises: assembling a basestructure comprising a plurality of interconnected panels forming avolumetric space having a front section and a rear section, with theopposing side panels forming a front access space and a rear accessspace, respectively, having a width that supports insertion of astandard full-width IT gear; and forming a plurality of guides locatedwithin interior surfaces of the opposing side panels at the frontsection, the plurality of guides running from the front section to therear section for receiving the block chassis.
 16. The method of claim14, wherein when N=2, the method further comprising: providing at leastone block chassis having one or more layers of two (2) side-by-sidefully functional IT gears inserted therein, wherein the two side-by-sidefully functional IT gears comprise two one-half width IT gear that areone half a size of a standard width IT gear.
 17. The method of claim 14,further comprising providing the three side-by-side fully functional ITgears by: providing a base panel for physically supporting IT gear; andproviding a pair of side panels for each one-third width IT sledattached to a respective base panel and having exterior indentations andprotrusions that enable interlocking of a protrusion of a first side ofone of the three IT gears into an indentation of the adjacent side of anext IT gear to provide flushed side-by-side alignment of each of thethree IT gears within the corresponding layer of the block chassis. 18.The method of claim 14, further comprising providing the one-third widthIT gear each having a width that is less than or equal to one-third of astandard nineteen (19) inch width rack that combine to create a 19 inchwide sled chassis.
 19. The method of claim 14, wherein a selectedone-third width IT sled comprises one of a computing node, a non hotplug storage nodes, a hot plug storage node, and a storage nodeconfigured as Just A Bunch Of Disks (JBOD).
 20. The method of claim 14,further comprising: inserting a selected row of three one-third width ITsleds comprising a non hot plug storage node placed between and to befunctionally shared by two computing nodes; and configuring thecomputing nodes to continue operating during cold servicing of the nonhot plug storage node.
 21. The method of claim 14, further comprising:attaching a vertical busbar to the rear section of the rack assembly;providing a horizontal busbar electrically connected to each one-thirdwidth IT bays of the block chassis and aligned to electrically connectto the vertical busbar; and inserting the block chassis into the rackassembly to electrically connect the horizontal busbar to the verticalbusbar for providing electrical power to each of the one-third width ITgears.
 22. The method of claim 14, further comprising oriented IT gearon the one-third width IT sled depthways along a motherboard from frontto back.